Unable to connect a website using LWP

Hi,

Iam trying to connect to a website
ftp://ftp.rcsb.org/pub/pdb/data/structures/all/pdb/ to download files
from there. I am using LWP for the same and I am getting the following
Error

Cant get ftp://ftp.rcsb.org/pub/pdb/data/structures/all/pdb/:
HTTP::Response=HASH(0x98ceb34)->status_line at try.pl line 18.

Where can I know what this error code stands for?

Here is the portion of the code referring to this problem

#! /usr/bin/perl

use warnings;
use strict;
use lib '/home/ms2/PERL/LWP/libwww-perl-5.800/lib/';
use LWP;

#Create a UserAgent object

use LWP::UserAgent;
my $ua = LWP::UserAgent->new;

#need to make a get request

my $url = 'ftp://ftp.rcsb.prg/pub/pdb/data/structures/all/pdb/';
my $response = $ua->get($url);

if ($response->is_success == 0 ) { die "Cant get $url:\n
$response->status_line"; }

else { # do something }
......other sections of code not added here ......

One more very basic question - what is the difference between CGI and
LWP and when do we use each-- that is- is LWP for client side
scripting and CGI for server side scripting?

Any help appreciated
Thanks

.

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